Linux Command Complete Reference: A Must-Have Handbook for Beginners

This article introduces the basics of Linux commands and commonly used tools, covering core operations and beginner tips. The basic command format is "command [options] [arguments]". Essential beginner tips include: using --help or man for help, Tab completion, Ctrl+C to interrupt, Ctrl+L to clear the screen, and ↑/↓/Ctrl+R to manage history commands. Core operations: Use ls (-l/-a/-h) to view files and directories, cd to switch directories (relative/absolute paths and ~/. ..), touch/mkdir to create files/directories, and cp/mv/rm to copy, move, and delete (be cautious with rm). For system information, use uname -a, uptime, df -h/free -h, and ps/top to manage processes. For text processing, use cat/head/tail to view files and grep -r to search for text. Software package management is divided into Ubuntu (apt) and CentOS (yum), requiring sudo for privilege elevation. Beginner pitfalls: Pay attention to permissions (sudo), avoid dangerous commands (e.g., rm -rf *), and practice basic commands (ls, cd, etc.) to quickly master daily operations.